Electroconductive coating formulations

Abstract

Electroconductive coating formulations consisting essentially of (1) a barrier coating which comprises a copolymer of ethylene and vinyl acetate, styrene-butadiene latexes, sodium alginate or fluorocarbons with starch; and (2) a conductive coating.

We claim: 
     
       1. An electroconductive article having improved solvent holdout and a low degree of tackiness, said article comprising: a substrate; a barrier coating coated on at least one side thereof, said barrier coating consisting essentially of a copolymer of ethylene and vinyl acetate, a styrene-butadiene latex, sodium alginate or a fluorosurfactant and a modified starch; and an electroconductive coating overlaying said barrier coating. 
     
     
       2. An article as in claim 1 wherein both sides of the electroconductive article have an electroconductive coating. 
     
     
       3. An article as in claim 1 wherein the electroconductive polymer is a member selected from the group consisting of poly-(dimethyl diallyl ammonium chloride), a copolymer of dimethyl diallyl ammonium chloride and diacetone acrylamide containing from 70 to 98% of diallyl monomer units, polyvinylbenzyl trimethyl ammonium chloride, polymethacryloyloxyethyl trimethyl ammonium chloride, polymethacryloyloxyethyl trimethyl ammonium methosulfate, polyepichlorohydrin 80 to 100% quaternized with trimethylamine, copolymers of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride containing from 90 to 99.5% methacryloyloxyethyl monomer units, poly-(methacryloyloxyethyl dimethyl hydroxyethyl ammonium chloride), and poly-(dimethyl propyl ammonium chloride). 
     
     
       4. An article as in claim 1 wherein the electroconductive polymer also contains a fluorosurfactant of the formula:   (C.sub.m F.sub.2m+1 C.sub.n H.sub.2n O).sub.y PO(OM).sub.3-y     wherein m is an integer between 4 and 10, n is an integer between 1 and 11, y is or 2 and M is a watersolubilizing cation selected from the group consisting of an alkali metal, ammonium or substituted ammonium, or ammonium bis(N-ethyl-2-perfluoroalkylsulfonamido ethyl) phosphates, containing not more than 15% ammonium mono(N-ethyl-2-perfluoroalkylsulfonamido ethyl) phosphates, where the alkyl group is more than 95% C 8  and the salts have a fluorine content of 50.2 to 52.8% as determined on a solids basis.   
     
     
       5. A method of preparing an article as in claim 1, said method comprising the steps of applying the barrier coating to at least one side of the substrate, drying the barrier coated substrate, applying the conductive coating over the barrier coating and drying the conductive coating.